Dvd X copy problems

[rerwi]

Hi, I have a dvd x copy on my system. I used it for about 15 of my dvd's to create backups. They worked great. But all of the sudden, the next 6-7 dvds I've backed up all have lines, boxes, (noise) in them so they don't play right or even at all. I didn't change anything. I loved the software, it costed me $99 at Compusa, but when it messed up, I thought, maybe my dvd-rom or dvd burner needed cleaning, so I bought a cleaner and cleaned them. That didn't work! So I bought a new dvd-rom and dvd burner , and that too didn't work. Any help on getting back to burning great dvd backups would greatly be appreciated. Compusa won't give money back for opened software, only exchange it for the same thing. And I can't get any answers from 321 studios. I stuck on this one, Please help!!! Thanks.